Finding the Fourth Proportional to 142,040.72, 196,040.04 and 85,457.36

Step by Step Solution

1. Step 1: Write the proportion equation
   142,040.72 : 196,040.04 = 85,457.36 : x
2. Step 2: Convert to fraction form
   142,040.72/196,040.04 = 85,457.36/x
3. Step 3: Cross multiply
   142,040.72x = 196,040.04 × 85,457.36
4. Step 4: Simplify right side
   142,040.72x = 16,753,064,272.69
5. Step 5: Solve for x
   x = 16,753,064,272.69/142,040.72
6. Step 6: Final answer
   x = 117,945.50